Since I usually leave for over a month I pack one bag for check, and a small one with one set of clothing for carry on. I don't like having too much to carry on because it's a pain and long walks through the airport dragging or carrying a bag + laptop bag hurts my back in the long run and since my flights are long haul it's just not worth it. So I pack several pairs of jeans and several tops to mix and match, plus the basics but nothing heavy...I can normally buy toiletries where I go.